music. fluently.
<span class="vcard">Angie</span>
Angie

Inclusive Piano Community – Register

Fluency Sessions

PIANO

Join our online community

Find support in a safe, judgement free zone

Explore your questions and piano related experiences

Register to Join a Session (Free)

Kindness, patience, and genuine welcome are at the heart of these sessions. Each participant is respected and encouraged, whatever their background or experience. All can explore and enjoy music at a comfortable pace, with support and a sense of safety, free from pressure or judgment. Here, music is for everyone, just as they are.

Please click here if the form doesn’t load on your device

Piano Community Register

Our vision is to create a reality where music learning and expression is accessible to everyone. Our sessions are open to all, and free to join. We are funded through the support of various organizations and patrons – click to learn more.

OUR GOAL

Provide a resource for those developing their skills and relationship with the piano, where all approaches and methods, learning styles and ideas are welcome.

Our Vision

Music can weave our stories into existence, contain them, and preserve them indefinitely. Music is for connection, expression, and appreciation. You'll find an authentic opportunity to explore and develop your own way with the piano and music in the spaces we create with one another.

gallery

Online Musical Fluency Community

Fluency Sessions

MUSIC

Join our inclusive online community 

Find support in a safe, judgement free zone

Explore your questions and share experiences learning music & your instrument

Join a Session

Do any of these resonate?

  • I want to understand music, not just memorize stuff
  • How do I improv with music and others?
  • I recently returned to my instrument after years of not playing
  • I want a better understanding of musical theory (the structure of music)
  • I feel like there’s just so much to learn, it’s overwhelming
  • How do I overcome the anxiety I feel associated with music/performing
  •  I want to learn a song by just hearing it…
  • How can I just play with others without already knowing the song?
  • I want to make my own music but I don’t really know how…
  • I just want to enjoy playing music with others
Drop in on a Session
zoom-meeting-logo-transparent-png-21
Sessions Archive
patreon-logo-circle-outline-icon-app-transparent-background-premium-social-media-design-for-digital-download-free-png

We meet over Zoom most Thursdays at 7pm (Mountain/UTC-6)

We have been meeting on Mondays, however with the school year resuming, we are shifting to Thursdays as of August 20, 2026. 

A community for music, shaped continually by each of us, together

Come with your questions, ideas, and requests for support
-we’ll address them during sessions. 

OUR GOAL

Provide a resource for those developing their skills and relationship with music and their instrument, where all approaches and methods, learning styles, and ideas are welcome.

Our Vision

Music can weave our stories into existence, contain them, and preserve them indefinitely. Music is for connection, expression, and appreciation. You'll find an authentic opportunity to explore and develop your own way with the piano and music in the spaces we create with one another.

Join a Session (Always Free)

Kindness, patience, and genuine welcome are at the heart of these sessions. Each participant is respected and encouraged, whatever their background or experience. All can explore and enjoy learning and creating music at a comfortable pace, with support and a sense of safety, free from pressure or judgment. Here, music is for everyone, just as they are.

Please click here if the form doesn’t load on your device

Complete the form and we'll send you an email with the meeting link

Music Community Register

Our vision is to create a reality where music learning and expression is accessible to everyone. Our sessions are open to all, and free to join. We are funded through the support of those who know why this matters – click to learn more.

gallery

Wandering the Intervals

Conjured by Chance

Dice Roll Composition Series​

In the Space Between

We often open moments in the quiet of the afternoon to explore and listen. Our children find themselves in spaces of contemplation, sunlight, and wandering within their mind and being. Today, I happened to step to the keys and roll the dice. The sequence that presented was a simple one, good for expanding the spaces between. 

They are present. They are absorbing. The shapes form. They integrate.

 - This is organic acquisition of music, fluently.

This session is unedited and exploratory. It is sensed, not thought. My fingers feel for spaces they wish to inhabit, not a form they have rehearsed.

  • The idea of this series isn’t necessarily to create fully produced material, it is to play. The dice offer their shape, the frequencies offer their cadence, and the rest just sort of shows up when we set the energy into motion.

A spontaneous conducting of my favorite type of puzzle, conceived by chance, and the roll of intent.

gallery

Waking the Moon

Conjured by Chance

Dice Roll Composition Series​

Waking the Moon

There are days and moments when one just needs an escape, even for a few moments. Often when I feel this sense pressing in, I will step away to the keys. Sometimes, the hands and mind direct the harmonic sequences in paths that offer the reframing and aligning that allows ease to return. Sometimes, the internal chaos creates a stagnation and the keys serve as nothing more than a resting place for fingers. It is in these moments I find myself most appreciative for the gift of these dice, that found a home here with us so many years ago. 

Something about taking the dice into my hands immediately generates a shift.
They offer a strange sense of comfort that only exists in the realm of not yet known.

They invite me to step back into being.

This roll is one of these instances, where the usually welcome cacophony grew into strain, and the moment I let the dice roll from my fingers, the energy began to breathe again. Maybe I’ll do something more with the roll, maybe it is complete. I’ll let the moon decide.

This session is unedited, and composed of single-take, on a piano that was tuned the week before-then the weather did its thing.

  • The idea of this series isn’t necessarily to create fully produced material, it is to play. The dice offer their shape, the frequencies offer their cadence, and the rest just sort of shows up when we set the energy into motion.

A spontaneous conducting of my favorite type of puzzle, conceived by chance, and the roll of intent.

gallery

Unbound

Conjured by Chance

Dice Roll Composition Series​

Unbound

This roll has been an intriguing one for certain. It began simple enough, and after a few iterations that offered themselves for exploration, things shifted. It decided.

A beautiful conversation was held, an idea was shared, and the frequencies were listening. Within moments, a response was known, and a space took form to hold within it, the possibility. 

When we move through life without a sense of being, we search for where we can find that which we can hold onto. Llike a tether, our ease and sense of security, can become reliant on a variety of anchors. While it feels reliable and trustworthy, the fibers of the tether determine their own tenacity.  

When our being is generated within the field in which we can expand and move, we are our own containment and our energy thrives. We are unbound, untethered, held in secure ease, and capable being. 

Unmastered, and composed of single-take tracks, this composition is spontaneous and exists in gentleness. Try headphones. It moves.

  • The idea of this series isn’t necessarily to create fully produced material, it is to play. The dice offer their shape, the frequencies offer their cadence, and the rest just sort of shows up when we set the energy into motion.

A spontaneous conducting of my favorite type of puzzle, conceived by chance, and the roll of intent.

May it hold you in serenity.

gallery

Another Day in Paradise

We had a lot of fun learning this song, exploring its framework and structure, and creating these sessions. 

The video is in 3 parts:

  • The first is us learning the song
  • The second is a close up of some fingers of mine, dancing on the keys
  • The third is open play and exploration, ideas, and some stuff to maybe ponder

    No expectations, just exploration. 
    We hope you’ll discover some pf the joy we felt, making this for you!
gallery

Why the Circle of 5ths Matters

The Circle of Fifths: An Ongoing Exploration of the Map

This is a new section on our site, requested by, and evolving dynamically in response to the interaction of those who engage in our circle building sessions.  Thanks for your patience as we build it.

You’ve probably heard that circle of fifths is a reference chart, and can function as a method and visual resource. It is all these, and it’s an ancient map woven from math, geometry, physics, and human wonder, that offers a portal constructed of connection.

The circle’s twelve-step version is a zoomed-out view of the universe of possible intervals, set into a twelve note system. We zoom out like this for ease and the sake of simplicity. Intervals are generated by multiplying or dividing frequencies, resulting in observable cyclical patterns. In this format, the circle is arranging the 12 tone chromatic scale in a sequence of perfect fifths.

The circle serves as a reference for understanding harmony, key signatures, and modulation. It is a representation of the relationships and interaction of frequencies, of the ratios that describe how sounds resonate together.

  • In its classic form, at each step we advance around the circle in an interval of 5. Starting at one position, we land at the fifth step away in the next, either ascending or descending (pitch, alpha, and numeric).
  • Defined by the frequency ratio 3:2, this 5th interval relationship is not an arbitrary invention; it’s a natural, physical phenomenon that musicians, along with scientists, philosophers, and mathematicians have recognized across cultures and time.
The image on the right, and description that follows, are from Joe Dubs & OmniCore Tech 
If you’re not familiar with Joe Dubs, take a moment to visit, it will be well worth your time.

This image unveils the profound geometric structure underlying musical harmony, revealing a sacred order woven into the fabric of sound itself.

At its core, this “Musical Geometry” diagram illustrates the harmonic relationships between fundamental intervals—the perfect octave (1:2), perfect fifth (2:3), and perfect fourth (3:4). These ratios are not arbitrary but are intrinsic to the very physics of vibration, echoing through nature, celestial mechanics, and human perception of consonance.

The circles interwoven in the central diagram reflect harmonic progression, where geometric relationships mirror the resonance of frequencies. This sacred design reflects the harmonic lattice, an ancient concept recognizing that music is not just an art but a mathematical and cosmic principle. The Fibonacci sequence, the Golden Ratio, and sacred geometry all find expression in these vibrational relationships.

For an incredibly simple and useful tool, visit Rand Scullard’s Interactive Circle

gallery

HoH | Quartz Explorations

The Secret Song of Quartz

Imagine holding a piece of quartz in your hand—the kind that glitters in Colorado creek beds or catches sun high on a mountainside. It seems still, timeless, and silent. But inside, a secret music is always playing.

The Universal Language of Vibration

Nikola Tesla’s vision of the universe as a system of vibrations resonates deeply with the principles of both quartz resonance and music. Let’s explore how these three elements interconnect, creating a harmonious tapestry of science, art, and philosophy.

Music and Harmony

Music, at its core, is the art of organizing sound waves into pleasing patterns. Different musical notes correspond to specific frequencies, and the relationships between these frequencies create harmonies. Just as a quartz crystal has a natural resonant frequency, musical instruments produce sounds based on their unique vibrational properties.
Exploring the Sound of Quartz
Reflections of a Universal Symphony
Engagement Opportunities
Harmonic Resonance Exploration
Quartz in Colorado
A Vibrational History

The Harmonic Convergence: Tesla, Quartz, and Music

Tesla’s Vision

Tesla believed that everything in the universe is in a state of vibration. He saw energy as a fundamental force that could be harnessed and transmitted through resonant frequencies. His experiments with wireless energy transmission and electromagnetic waves were attempts to tap into this universal language of vibration.

Quartz Resonance

Quartz crystals, with their precise piezoelectric properties, are natural translators of mechanical stress into electrical signals. When a quartz crystal vibrates at its resonant frequency (e.g., 32,768 Hz in watches), it creates a pure, stable oscillation that can be used to keep time with remarkable accuracy.

The Convergence

Frequency and Pitch

  • In music, the pitch of a note is determined by its frequency
  • A quartz crystal’s resonant frequency is its unique pitch
  • Tesla’s experiments with electromagnetic waves explored the transmission of energy at specific frequencies, much like how musical notes are transmitted through the air

Harmonics and Overtones
Musical instruments produce the fundamental frequency and harmonics and overtones. These additional frequencies create the rich, complex sound of an instrument.

Resonance and Amplification
In music, resonance occurs when an object vibrates at its natural frequency, amplifying the sound. Tesla’s work with resonant transformers and wireless energy transmission relied on the principle of resonance to amplify and transmit energy. A quartz crystal’s piezoelectric effect is a form of resonance, converting mechanical energy into electrical energy.

Resonance: A Multidisciplinary Exploration Project

“Waves of Connection”

Core Project Components
  1. Quartz Crystal Resonance Instrument
  2. Collaborative Sound/Wave Generation
  3. Interconnected Measurement Systems

  • Experimental Explorations

    Quartz Crystal Music

    Materials

    - Quartz crystal
    - Tuning fork or smartphone tone generator
    - Metal plate or glass surface
    - Fine sand or salt

    Place the quartz crystal on the metal plate or glass surface. Use the tuning fork or tone generator to produce different frequencies. Observe how the crystal responds to different frequencies. Sprinkle fine sand on the surface to visualize the geometric patterns created by the sound waves (cymatics).

    • How does the quartz crystal's response to different frequencies relate to musical harmonies?
    • Can you hear the crystal's vibration, and how does it compare to musical notes?
    • How does Tesla's concept of wireless energy transmission relate to the way sound waves travel through the air?

  • Quartz crystals are living bridges between different forms of energy - mechanical, electrical, and sound

    Sound and Vibration Experiment

    Materials

    - Quartz crystal (clear, well-formed)
    - 9-volt battery
    - LED
    - Copper wires
    - Tuning fork or smartphone with tone generator app
    - Thin metal plate or glass surface
    - Fine sand or salt

    The Experiment: Seeing Sound, Feeling Vibration

    Stage 1: Electrical Resonance
    Connect quartz to LED (as in previous experiment) and observe how physical stress creates electrical response

    Stage 2: Sound Resonance
    Place quartz on metal plate or glass surface, and using a tuning fork or tone generator, create different frequencies and observe how the crystal responds

    Different frequencies create different vibration patterns. Some frequencies will make the crystal "sing" or vibrate more intensely

    Optional Cymatics Visualization

    • Sprinkle fine sand on the surface near the crystal
    • Watch geometric patterns form as sound waves interact with the surface

  • Energetic Communication

    Harmonic Resonance Sculpture

    Materials 

      - Multiple quartz crystals of varying sizes
      - Arduino or Raspberry Pi microcontrollers
      - Piezoelectric sensors
      - Sound output devices (speakers)
      - Interactive touch interfaces

      - When we touch a quartz crystal, it generates a unique frequency

      - Crystals communicate and blend frequencies, with them, we can create a collaborative musical/sound experience

      - Visualizes how individual "waves" interact and create harmony

The Experiment: Making Quartz “Speak”

Creating a Piezoelectric Connection, we will need a clear, well-formed quartz crystal, preferably with sharp, clean edges

Step 1: Carefully tape copper wires to opposite sides of the quartz crystal

Step 2:  Connect wires to the LED and battery

Step 3: Gently squeeze or tap the crystal. The crystal will generate a tiny electrical charge when physically stressed

If we have an LED nearby, it might briefly light up

We’re literally turning mechanical energy into electrical energy!

Expanded Research 

– Quantum entanglement
– Cymatics
– Biorhythms
– Geological time scales
– Electronic music composition
– Interactive art installations

Reflections

Tesla’s vision of a universe composed of vibrations finds a tangible expression in both the precise oscillations of a quartz crystal and the harmonious patterns of music. Each note in a musical composition, each vibration of a quartz crystal, and each electromagnetic wave in Tesla’s experiments are part of the same universal symphony, a harmonious dance of energy and matter.

By exploring these connections, we gain a deeper appreciation for the interconnectedness of all things and the fundamental role that vibration plays in shaping our world. The precise ticking of a quartz watch, the resonant frequencies of a musical instrument, and the wireless transmission of energy are all part of the same vibrational tapestry.

Tesla, quartz, and music all share one fundamental principle: resonance.  

– Tesla’s experiments were built around the idea that electrical energy can be transmitted through the air when the source and receiver are tuned to the same frequency. He generated huge, high‑frequency oscillations and watched the energy “hop” from one resonant circuit to another.  

– Quartz crystals are natural resonators. When you stress them they produce an electric charge at a very precise natural frequency (≈ 32 kHz for watches). If you drive a quartz crystal with an external sound wave that matches its natural frequency, the crystal vibrates strongly. It’s just like a guitar string that sings when you pluck it at its resonant pitch.  

– Music is organized sound waves. When two notes share a simple frequency ratio (e.g., an octave, a perfect fifth), their waveforms line up periodically, creating a pleasant, reinforcing pattern. We call this harmonic resonance.  

Because all three systems rely on matching frequencies to amplify or transfer energy, the “vibration” you hear in a quartz crystal, the humming of a Tesla coil, and the chords of a musical instrument are different expressions of the same physics. They each turn a tiny, periodic motion into a larger, perceptible effect, and they all illustrate how the universe communicates through energy, frequency, and vibration.

Harmonic Resonance: The Universal Language of Vibration

Engagement 1: Visible Harmony & Resonance

Crystals, Airwaves, and the Touchless Song of the Theremin

Components

– Theremin
– Quartz crystals
– Curious kids

Imagine a quartz crystal, humming silently in your palm, and the invisible song of the theremin, floating on air when you move your hands. Both are instruments of music, of energy, frequency, and of resonance.

Quartz, has a perfectly ordered atomic lattice that vibrates at unwavering, natural frequencies. When you squeeze, tap, or sing to it, it moves and transforms your action into an electrical pulse called piezoelectricity. This is how a crystal in a radio or old phone feels the buzzing airwaves and turns them into music or messages we can hear.

Have you ever seen someone play a theremin? Underneath its haunting sound is a delicate dance happening between electric fields and radio waves. When we play the theremin, our hands interact with these fields, shifting frequency, just as a tap or squeeze changes how quartz vibrates. Even though we don’t see the dance of energy, it is and our interaction  coaxes it into resonance.

Nikola Tesla was a guy who always seemed to see connections, and he knew that both quartz and the theremin operate by the same law: energy in motion creates waves, and waves can travel, combine, and even carry music through the air or stone.

__________________________

When a theremin makes a note, internal circuits use quartz (or sometimes other oscillators) to steady the frequency, ensuring the sound is pure and unwavering.

When quartz vibrates, it “broadcasts” an electric signal, which can be tuned and mixed, resonating in radios, microphones, and in the theremin’s circuits.

Music is woven from the resonance between energy, material, and presence

When you listen to a theremin’s voice, think about the crystal quietly beating inside a radio, a clock, or the bedrock beneath your feet. Both are proof that the world itself sings.

__________________
The theremin’s earliest stable forms used quartz crystal oscillators for their pitch circuits.

Engagement 2: Quantum Entanglement Communication Prototype

Demonstrating wave propagation and connection

Components

  – Paired quartz crystal oscillators
  – Signal transmitting crystal bowls
  – Mallets and lazer lights
  – Collaboratively create resonance

Interactive Elements
 – Participants create waves through touch/input
  – Waves transmitted between paired crystal bowls
  – Visual/audio demonstration of wave transformation
  – Explores concepts of quantum communication

Engagement 3: Geological Time and Personal Rhythm Installation

Connect personal biorhythms with geological time

Components

  – Quartz crystals from Colorado
  – Biometric sensors
  – Real-time data visualization
  – Musical/sound generation system

Experience

  – Participants connect personal heart/breath rhythms
  – Rhythms translated through quartz crystal oscillators
  – Create collective “geological music”
  – Visualize interconnectedness of personal and geological time

Harmonic Resonance Exploration

Key Observation Points

– Every object has a natural frequency
– Quartz crystals can generate electricity when stressed, vibrate at specific frequencies, and transform energy between different states

Resonance as a Universal Principle

Everything vibrates:

  • Atoms
  • Molecules
  • Crystals
  • Human bodies
  • Planets
  • Entire universes

– How are musical harmonies similar to crystal vibrations?
– Can you feel the “rhythm” of the crystal?
– What happens when different frequencies meet?

Deeper Exploration

Experiment with: different crystal sizes, various sound frequencies, and multiple crystals together

Scientific Principles Demonstrated

– Piezoelectricity
– Cymatics
– Wave interference
– Energy transformation
– Resonant frequency

Writing Ideas

– Crystals as “translators” between different energy states
– Vibration as a fundamental language of connection
– Every “thing” has its own unique song

Additional Exploration

– Research quantum entanglement
– Explore sound healing practices
– Study molecular vibration in different states of matter

Educational Objectives

– Demonstrate piezoelectric principles
– Explore wave propagation
– Understand resonance
– Highlight interconnectedness
– Blend art, science, and human experience

Potential Collaborators

– Local universities (Physics, Music, Engineering departments)
– Science museums
– Electronic music composers
– Quantum physics researchers
– Geological societies

Technical Challenges

– Precise frequency measurement
– Signal translation
– Real-time collaborative interface
– Maintaining crystal integrity
– Creating meaningful visualization

Connections

– Explore how individual “waves” create collective experience
– Demonstrate interconnectedness of natural systems
– Show how tiny changes create significant transformations

Expanded Research 

– Quantum entanglement
– Cymatics
– Biorhythms
– Geological time scales
– Electronic music composition
– Interactive art installations

 

Quartz, Crystals, and Colorado: An Unexpected Connection

Colorado might seem far from the Parisian laboratories where the Curie brothers made their initial discoveries, but the state has a fascinating relationship with quartz that adds an intriguing layer to the story of timekeeping.

The Rocky Mountains, in Colorado, are a geological treasure trove of mineral formations, including some of the most remarkable quartz deposits in the United States. The Crystal Peak area in Teller County, located near Pikes Peak, is particularly famous for its exceptional quartz crystals. These  rocks are potential precision instruments hidden in the mountain landscape.

Colorado’s Crystal Connection

During World War II, the demand for high-quality quartz crystals skyrocketed. Radio technology and early electronic communications required precise crystal oscillators, and Colorado’s mineral deposits became strategically important. The U.S. government even established programs to collect and process quartz crystals from Colorado’s mountains, recognizing their potential for military and scientific applications.

An Unexpected Technology Hub

Colorado would later become a hub for the very technologies that quartz crystals would enable. The state’s Silicon Mountain corridor (centered around Boulder and Denver) became home to numerous electronics and technology companies that would rely on the precise oscillation properties first discovered by the Curies.

Companies like Ball Aerospace, now BAE Systems, in Boulder, have used precision crystal technologies in everything from satellite navigation systems to space exploration equipment. The very crystals that could keep a watch ticking perfectly are now helping to navigate spacecraft and collect data from the far reaches of our solar system.

The Geological Story

The quartz crystals of Colorado tell a story millions of years in the making. Formed deep underground under immense pressure and heat, they emerged from the earth’s crust as the Rocky Mountains were thrust upward. Each crystal carries within it a record of geological time.

It’s a beautiful symmetry: a rock formed by immense geological forces, shaped by human curiosity, becoming an instrument that, when pressure is applied, measures the most precise increments of human experience.

Colorado, Tesla, and Resonant Frequencies: A Vibrational History

Nikola Tesla’s Colorado Connection

In 1899, **Nikola Tesla** chose Colorado Springs as his personal laboratory, establishing a research station that would become legendary in the world of electrical science. The location wasn’t random. Colorado’s high altitude, clear atmosphere, and unique geological composition made it a perfect natural laboratory for his groundbreaking experiments in electromagnetic waves and energy transmission.

Tesla’s Colorado Springs Laboratory

– Established in 1899
– Created massive electrical discharges
– Conducted experiments in wireless energy transmission
– Produced artificial lightning up to 135 feet long
– Demonstrated wireless transmission of electrical energy

NCAR: Modern Scientific Resonance

The National Center for Atmospheric Research (NCAR) in Boulder represents a direct continuation of the scientific curiosity that drove Tesla. Located on the edge of the Rocky Mountains, NCAR sits at the intersection of geological wonder and cutting-edge scientific research.

Resonance Connections

– Studies wave propagation in atmospheric systems
– Explores vibrational patterns in natural systems
– Uses advanced sensing technologies that echo Tesla’s early work in energy transmission

Tesla’s Vibrational Philosophy

Tesla believed that everything in the universe is fundamentally a system of vibrations. His work with frequencies and energy transmission parallels our exploration of quartz crystals’ piezoelectric properties.

– Both explore energy transformation
– Both see vibration as a fundamental language of the universe
– Both demonstrate how seemingly solid matter is actually in constant motion

Thought to Take With You

Tesla once said: “If you want to find the secrets of the universe, think in terms of energy, frequency, and vibration.”

The quartz crystal in your hand, the mountains of Colorado, the atmospheric research at NCAR, and Tesla’s visionary experiments are all part of the same fundamental conversation about how energy moves, transforms, and connects.

gallery

Fluency Project | Hands on History CO | Sacred Pulse

The Soundscape of Existing

Where your unique story meets shared tradition, and every voice finds the confidence to belong

.cls-1{fill-rule:evenodd;}
Resources
.cls-1{fill-rule:evenodd;}

Anchoring Across Time

Music Holds Community and Place

Belonging and Invitation

The Power of Reference

From the Land, to the Voice, to Each Other

SEGMENT MAIN

In every era, music has served not just as entertainment, but as an anchor and a tool for community

Within family and culture, land and cosmos, music is the keeper of memory and a force for connection at every layer.  

gallery

Fluency Project | Hands on History CO | Harmony

The Soundscape of Connecting

HARMONY: WHERE OUR STORIES MEET

.cls-1{fill-rule:evenodd;}
Resources
.cls-1{fill-rule:evenodd;}

When Energy Dances

The Nature of Harmony

Harmony's Geometry

Tangible Creation

Entangled Resonance

SEGMENT MAIN

Harmony is not just an effect, but a beckoning.
It invites us into ever-evolving beauty, surprising connections, and the shared experience of awe.

Harmony is the creative joining of unique sounds, voices, frequencies, and energies, forming new beauty through resonance and interaction.

SEGMENT MAIN
gallery